https://speakerdeck.com/coe/iosdc-2019-ble
iOSDC 2019 BLE - Speaker Deck
iOSDC 2019 BLE and L2CAP
https://speakerdeck.com/kyoheig3/iosdc-2017
iosdc_2017.pdf - Speaker Deck
https://speakerdeck.com/miyasakakazutoshi/miyasaka-iosdc-lldb-cfp
miyasaka_iosdc_lldb_cfp.pdf - Speaker Deck